Pulmonary arterial hypertension, pulmonary veno-occlusive disease, and pulmonary capillary hemangiomatosis are included in the same group (group 1) of clinical classification of pulmonary hypertension.1 Histological changes in the small pulmonary arteries (ie, intimal fibrosis and medial hypertrophy) are similar in these 3 diseases, and clinical presentations of the 3 diseases are often indisti...

• The amplitude of the capillary pulse is markedly dependent on resistance to blood flow through precapillary vessels. Recent studies by Lee and DuBois indicate that blood flow through the pulmonary capillaries * is normally pulsatile. This result points to the possibility that reactions of pulmonary arterial vessels may be studied by their effects on the amplitude of the pulmonary capillary pu...

RUDOLPH, ABRAHAM M., M. DAVID KURLAND, PETER A. M. AULD AND MILTON EL PAUL. Effects of vasodilator d ugs on normal and serotonin-constricted pulmonary vessels of the dog. Am. J. Physiol. I g7(3) : 6 I 7-623. I gsg.---Previous studies of the action of vasodilator drugs on the pulmonary blood vessels have yielded inconclusive results. Studies on the effects of continuous infusion of vasodilator a...

Histamine constricts airways and pulmonary blood vessels in isolated lungs, but is said to dilate pulmonary blood vessels in intact animals. The present experiments test the hypodiesis that histamine only constricts pulmonary blood vessels, and that dilatation depends on epinephrine released by histamine from die adrenal glands. In cats anesthetized with pentobarbital, the difference in pressur...

To investigate the relationships between local platelet activation in pulmonary vessels and pulmonary artery pressure circulating platelet aggregates and plasma beta-thromboglobulin (beta-TG) levels were evaluated in peripheral venous blood and blood from different sites of pulmonary circulation (right ventricle, pulmonary artery and arteriolo-capillary bed) in 29 patients with COPD. Fifteen ha...

Abstract Blood flow through a vascular bed is usually determined by the pressure gradient across it and diameter of precapillary resistance vessels. Special circulations have additional specific features blood control. Several organs control their supply autoregulation. Coronary linked to myocardial oxygen consumption, primarily metabolic mechanism. Increases in demand or decreases cau...

This paper presents vascular tree reconstruction and artery-vein separation methods from 3D thoracic CT-angiography (CTA) images. In the methods, the lungs, blood vessels and the heart are segmented by using intensity-based thresholds and morphological operations. After the distance transform for the regions of blood vessels and the heart, we compute seed points that are the maxima of distance ...

OBJECTIVES This study attempted to provide a formula for calculation of the pulmonary/systemic flow ratio in children after bidirectional cavopulmonary anastomosis. BACKGROUND With the bidirectional cavopulmonary anastomosis, only the superior vena cava blood is oxygenated by the lungs. The inferior vena cava flow recirculates into the systemic circulation. The ratio of these flows will deter...

BACKGROUND Doppler images of pulmonary vessels in pulmonary diseases associated with subpleural consolidations have been described. Color Doppler easily identifies such vessels within consolidations while spectral Doppler analysis allows the differentiation between pulmonary and bronchial arteries. Thus, Doppler helps in diagnosing the nature of consolidations. To our knowledge, Doppler analysi...